Which of the following is a superfluid?

  • A
    Krypton $I$
  • B
    Argon $II$
  • C
    Helium $II$
  • D
    Helium $I$

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Identify the correct statements from the following.
$I$. Glass is an extremely viscous liquid.
$II$. Increase in temperature decreases the surface tension of liquids.
$III$. Compressibility factor for an ideal gas is zero.

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